张超;姚炜;王宏大;雷蕾;陈亮;
安徽江淮汽车股份有限公司技术中心
摘要：在发动机设计开发过程中,需要评估进气歧管是否满足进气均匀性的标准。首先利用1D-3D耦合方法计算得到进气歧管的平均质量流量,然后将其作为三维数值计算的输入边界。利用fire软件对初始进气歧管进行CFD分析,计算出各缸的流量系数及其偏差。针对存在压力损失的部位进行优化,直到其进气均匀性满足标准。结果表明:通过1D-3D耦合方法可以为三维数值计算提供准确的输入边界;通过CFD方法可以发现进气歧管结构中对流动不好的部位;通过CFD方法进行优化设计分析已经成为进气歧管设计过程中的重要手段。
关键词： 进气均匀性;;流量系数;;耦合
Abstract: Numerical Simulation were
performed in KIVA 3 to investigate the effect of three kinds of
biodiesel(soybean oil methyl ester,palm oil methyl ester and Jatropha oil
methyl ester) on the combustion characteristics and emissions formation
processes in a compression-ignition engine,compared with that of diesel fuel
respectively.The results showed that biodiesels and diesel combustion
characteristics were basically the same during the initial stage of
combustion,and in the late combustion,the average cylinder temperature of
biodiesels were lower than that of diesel,especially Jatropha oil methyl
ester.Biodiesels produced lower soot and CO emissions than diesel fuel.Because
of the effect of the cylinder temperature,biodiesel produced lower NOxthan
diesel.Among these biodiesels,NOxemission of Jatropha oil methyl ester was
lowest.
Keywords: Compression-ignition
Engine;;Biodiesel;;KIVA3;;Combustion Performance,Emission Performance
参考文献：
[1]陈家瑞.汽车构造(上册)[M].北京:机械工业出版社,2009:190-193.
[2]王立辉,张超,王宏大,王军,雷蕾.发动机进气歧管优化设计分析[J].汽车制造业,2013,22:74-75.
[3]周龙保.内燃机学[M].北京:机械工业出版社,1996:82-86.
[4]石皓天.GDI汽油机进气系统的数值模拟研究:[学位论文],天津:天津大学,2008.
[5]苏晓燕,刘云卿,冯晓娟,杨陈,沈源,由毅,冯擎峰.三缸增压汽油机进气歧管设计与优化[J].小型内燃机与摩托车,2013,42(4):54-58.
[6]崔怡,高莹,李君,杨思.进气歧管结构对进气不均匀性影响的仿真研究[J].小型内燃机与摩托车,2009,38(2):37-40.
[7]刘国庆,杨万里,邓晓龙.发动机进气歧管进气过程1D-3D耦合数值模拟研究[J].汽车制造业,2007,17:43-45.
[8]钱多德,姚炜.汽油机排气起卦内流场CFD模拟[J].内燃机与动力装置,2010,119(5):30-32.
[9]叶明辉,黄露,等.基于一维、三维及耦合模型的汽油机进气系统优化[J].车用发动机,2007,169(3):44-49.
[10]陈征,张波等.基于数值模拟的排气歧管优化策略[J].内燃机工程,2009,30(3):51-56.
|
